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A tautonym is a word formed by repeating the exact same sequence of letters twice (such as "couscous", "beriberi", "hotshots", "murmur", or "cancan").
In linguistics and biology, tautonymy refers to identical duplication. In English orthography, tautonyms represent a rare form of balance where a word can be cleanly divided down the middle into two identical halves (e.g. cous-cous, beri-beri, car-a-car-a). Many entered English as loanwords from Polynesian, Austronesian, and West African languages where morphological reduplication conveys intensity, pluralization, or natural species naming.
Words formed by repeating the exact identical letter sequence twice
Deficiency disease caused by a lack of thiamine (vitamin B1).
North African steamed semolina granule dish (cous + cous).
Conspicuously skilled or daring individuals (hots + hots).
Long-legged South and Central American falcon species.
Test any English word to verify exact two-half orthographic symmetry:
Verified English words exemplifying tautonyms (repeated halves) with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
A tautonym is a single word formed by repeating the identical letter sequence twice, such as "couscous" (cous + cous) or "beriberi" (beri + beri).